Interleukin-1 exacerbates focal cerebral ischemia and reduces ischemic brain temperature in the rat

Adrian R Parry-Jones, Timo Liimatainen, Risto A Kauppinen, Olli H J Gröhn, Nancy J Rothwell

Research output: Contribution to journalArticle (Academic Journal)

14 Citations (Scopus)

Abstract

The proinflammatory cytokine interleukin-1 (IL-1) is a key mediator of inflammation in cerebral ischemia, but its precise mechanisms of action remain elusive. Temperature is critical to outcome in brain injury and given the importance of IL-1 in pyrogenesis this has clear mechanistic implications. IL-1 exacerbates ischemia independently of core (rectal) temperature. However, it is temperature in the ischemic brain that influences outcome and rectal temperature is likely to be a poor surrogate marker. This study tested the hypothesis that IL-1 exacerbates cerebral ischemia by increasing ischemic brain temperature. Wistar rats undergoing transient middle cerebral artery occlusion received either 4 microg/kg IL-1 (n=9) or vehicle (n=10) intraperitoneally. NMR-generated maps of brain temperature, tissue perfusion, and the trace of the diffusion tensor were collected during occlusion, early reperfusion, and at 24 hr. IL-1 significantly increased ischemic damage at 24 hr by 35% but rectal temperature did not vary significantly between groups. However, ischemic brain was 1.7 degrees C cooler on reperfusion in IL-1-treated animals (vs. vehicle) and a corresponding reduction in cerebral blood flow was identified in the ischemic striatum. Contrary to the stated hypothesis, IL-1 reduced ischemic brain temperature during reperfusion and this may be due to a reduction in tissue perfusion.
Original languageEnglish
Pages (from-to)1239-49
Number of pages11
JournalMagnetic Resonance in Medicine
Volume59
Issue number6
DOIs
Publication statusPublished - 2008

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